Boiler.



WJ'F. SELLERS & G. J. DAVIDSON.

BOILER.

APPLICATION FILED APR. 9, 1909.

Patented Nov. 15, 1910.

3 SHEETS-,SHEET 2.

ninguna 11mm/vsn w'NESSES: l

W. P. SELLERS 6r' C. J. DAVIDSON.

BOILER.

APPLIOATIDN FILED APRA.

Patented Nov. 15, 1910.

.'i SHEETS-SHEET 3.

UNiTED STATES PATENT oEEioE.

WILLIAMl F. SELLERS, OF WILMINGTON, DELAWARE,

AND CHARLES J. DAVIDSON, OF

MILWAUKEE, WISCONSIN, ASSIGNORS TO EDGE MOOR IRON COMPANY, OF EDGE- MOOR, DELAWARE, A CORPORATION OF DELAWARE.

BOILER.

Specification of Letters Patent.

- Patented N 0V. 15, v1910.

Original application filed March 15, 1907, Serial No. 362,541. Divided and this application led April 9, 1909.

Serial No. 488,834.

To all whom it may concern:

Be it knownthatwe, WILLIAM F. Snif.A

LEES, residing at Wilmington, county of New castle, State of Delaware, and CHARLES J. DAVIDSON, residing in Milwaukee, county of Milwaukee, and State of lVisconsin, both citizens of the United States of America, have invented a certain new and useful Improvement in Boilers, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof. ,f

This invention relates to steam generating boilers and is particularly designed for use with the box header type of water tube boiler, though the invention in all of its aspects is not limited to such use.

The object of the invention is to improve a boiler of this kind by providing a novel housing therefor, characterized by its mechanical strength, heat insulating properties, durability, and the ease and comparatively low cost of assembling it and repairing it when necessary.

The various features of novelty which characterize our invention are pointed out .with particularity in the claims annexed to vFor a better un and forming a art of this specification.

erstanding of our invention, however, and the advantages possessed by it, reference may be had to the accompanying drawings and descriptive matter in which we have illustrated and described farms in which our invention may be elnbodied.

Of the drawings Figure l is a side elevation of a boiler with the outside heat insu! lating covering shown in dotted lines. Fig.

:J2 1s a perspective'view of a portion of a tube and the tiling or brick in which it is totally embedded. Fig. 3 is a view similar to Fig. 2 showing a construction in which the tube is only partially embedded in the tiling. Fig. 4 is a sectional elevation of theboiler, taken on the line 4 4 of Fig. 5. Fig. 5 is a sectional elevation on the line 5 5 of Fig. 4. Fig. 6 is a sectional elevation on the line 6 6 of Fig. 4. Fig. 7 is a sectional plan showing a side wall ofthe boiler housing. Fig. 8 is a partial front end elevation showing a modified form of connection of the front header to the water legs. Fig. 9 is a partial y tube C1.

portion ofthe' transverse section of the boiler containing the modication of Fig. 8 taken similarly to Fig. 5 but with the outer heat insulating jacket removed. Fig. l0 is a partial rear end elevation of the rear header showing a third arrangement of supporting the rear header and connecting it to the water legs.

In the form of our invention shown in Figs. l to 7, the boiler proper consists of a front -box-like header A and a rear boxlike header B, which are lconnected at their lower ends by the usual set of inclined water tubes C and at their upper ends by the usual horizontal steam and water drum or large The front header A to which the upper ends of the tubes C are connected is supported by two hollow columns or water legs D, which engage the under` ends of the header at opposite sides of the boiler. Each column D is placed in communication with and mechanically connected to the header A by a nipple D1. The rear header B is supported by two hollow columns or water legs E located one at each side of the boiler. As shown, bearing plates El are located between the header B and the upper ends of the columns E, to permit the sliding movement between the header B and the water columns E resulting from the expansion and contraction of the boiler parts as their temperatures vary. The water columns E are connected at their lower ends by a mud drum F, having a blow-out aperture F1. The drum F is in communication with the header B through flexible conduits or tubes F2. The columns D and E at each side of the boiler are connected to each other by a set of inclined tubes G which are in the same vertical plane with, and are parallel to, the vcorresponding outside row of tubes C. It will, of course, be understood that the front header of theboiler may be movably Supported by the'water columns and the rear header rigidly supported instead of as in the arrangement just described.

The usual abutment or wall H forms the rear wall of the fire box and supports the rear ends of the grate bars H1, the front ends of which are supported by the front wall I of the fire box. The usual diaphragms or bailies J are provided to cause the liame to circulate in ythe manner indicated by the large arrows in Fig. 4.

- on the blocks.

The side walls of the furnace are lined by blocks of heat resisting-tile or brick'. K. As

shown in Figs. 5 and G, the tiles K vare so formed that the outer halves of the outer row of tubes and the portions of the tubes (ir at the rear of the wall H are. partially embedded in the tiling, while the portions of the tubes G at the side of the tire box are entirely embedded in the tiling.

The tiling is held in* place against the tubes C and Gr by an outer frame-work consisting of vertical metal bars L, each of which in the formshown has a portion of rib L1 extending transversely to the side of the furnace, and having its inner edge bearing against the outer surface of the tiling, and cross bars L3, L4 and L5. From the outer edge offeach rib L1 extend flanges or ribs L2, which are parallel to the side of the furnace. Pads M of suitable. heat insulating material are preferably inserted between the tiling and the adjacent edge of the rib L1. In the form shown the upper cross bars L3 and L4 are riveted at their ends to the headers A and B and the lower cross bars are anchored in any suitable mannerto the boiler structure or foundation. Between each adjacent pair of ribsL1 and between the tiling and the flanges L2 are removably inserted a series of blocks N of-a heatinsulating material. AThese blocks may ,consist of layers N1 of an asbestos composition having air cells N2 formed inthem. Preferably `an air space O is 4formed between the tilingV and the blocks N. The blocks and the tiling maybe spaced apart to form `the air space O, by the spacers O1 which may be in the form of lugs formed either on the tiling or The boiler as a whole may be covered by a jacket or coating of a heat insulating plaster or compound P. It will be understood that the boiler is connected at its rear end to a source of cold water in any suitable manner (not shown lin the drawmssl- With the construction described the C11'- culation through the tubes (i is as follows: Relatively cold water enters the drum F from lthe header B through the tubes F2. From' the drum F water passes into the colY umns E, and from them through the tubes G r and water columns D into the header A. The circulation of the water through the tubes G not onlyxincreases the capacity of the boiler by increasing the effective heating surface, but also prolongs the life of the tiling by withdrawing heat from it as well as directly from the flame... The water columns and tubes serve, therefore, not only as an effective sup ort for the boiler setting, but also as an e cient feed water'heater, while at the same time they make the boiler more durable. We make no claim herein, however, to the arrangement of the hollow supporting columns and connecting tubes lsimilar pintle or trunnion E". Iplate E2 connects each pair of bosses, being broadly: Such parts are claimed herein only in combination with the other features which unite to form the boiler housin The arrangement of hollow supporting coumns and connecting tubes in conjunction with the box header type of water tube boilers is claimed independently of the housing in our copending application Serial No. 362,451, filed March 15, 1907. i

The boiler housing describedis simple and relatively cheap to construct, possesses good mechanical and heat insulating properties, and may be repaired with' comparative ease. y y

Under some conditions we find it desirable to make the lire box wider than the boiler proper. One means of accomplishing this is illustrated in Figs. 8, 9 and 10 where the tubes G and front and rear water legs D and E, at one side, of the boiler arenot in the salne plane with the outer row oftubeS.` C butare at one sideof said plane. With this construct-ion thefront legsW D are connected to the header .A by means of hori-` zontally extended hollow trunnions or nipples Al, having flanges A2 secured to the header, which trunnions or nipples extend laterally into the legs D through openings formed vto receive them. In this form each leg E is provided with a pintle or trunnion E3 and the header'B is provided with a. A rocker provided with a lower aperture receiving the pintle E3, and an upper aperture receivin the pintle E4.

ico

ere the tubesGr are spread apart the I single vertical tile retaining parts `L of the construction shown in Figs. l to 9, inclusive, are replaced by similar but `shorter uplower bars L7 at the sides of `the tubes Gf The lower ends of the bars L6 are connected to a cross bar L and the upper ends of` the bars L7 are connected. to a cross bar L1".

Short horizontal bars L8 connect the cross bars L and L10.

In" Fig. 9, as in Figs. 5 and 6, for convenience and simplicity the blocks N and spacers O1 are omitted. In Fior. 9,' also, the

per bars L6 at the sides of the tubes C and `v outer heatV insulating layer P 1s omitted to simplify the illustration of the `feature of the constructionl intended to be shown by this Ii re. y While the forms of our linvention disclosed have been found Iin actual practicev to be very satisfactory,l it will be readily understood by those skilled in the art that Achanges may be made in the form of our iinvention without departing from its spirit.

Having now' described our invention, what we claim as new, and'desire to'secure by' Letters kPatent is# Y l. In a water tube boiler having tubes at its sides, a boiler housing'having side walls each bar belng provided at its outer edge with anges extending toward the adjacent bars and blocks of heat insulating material removably inserted between each adjacent pa'ir of bars and retained in flanges.

2. In a water tube boiler having tubes at its sides, a boiler housing having side walls formed, by tiling bearing against the side tubes of the boiler, tiling -retaining devices comprising a series of parallel bars at each side of .the boiler, the inner edges of said bars holding the tiling against the tubes, each bar being provided at its outer edge with flanges extendingvtoward the adjacent bars, blocks of heat insulating material removably inserted between each adjacent pair of bars and retained in place by said anges, and means for spacing said blocks away from the tiling.

3. A housing for a boiler having a'lower portion o greater width-than the upper portion and having tubes at its sides, said 'ousing comprising tiling bearing against said tubes, tlling retaining devices atv each place by said side of boiler," comprising a series of par- -allel bars at the side ofthe lower portion of the boiler and a similar series of parallel bars at the side of the upper portion of the boiler, a frame member to which the u per ends of the series of bars at the side o the lower port-ion are connected, another framel member to which the lower ends of the series of bars at the side of the upper portion of the boiler are connected, and horizontal tie bars connecting said frame members, the inner edges of said bars of said series holding the tiling against said side tubes, and each bar of sa 1d series being providedv at its outer edge with flanges extending toward the adjacent bars of the'` same series, and blocks of heat insulating material removably in-' serted between each adjacent pair of bars and held in place b said flan es. WM. SELLE CHARLES J. DAVIDSON.

Witnesses to the signature of William F. Sellers:

' CHAs. J. GERVIN,

H. B. BRADFORD.

Vitnesses to the signature of Charles J. Davidson:

M. S. RAUsoH, GEO. F. KELLY. 

